Isidro Metapan of El Salvador and Club Santos Laguna of Mexico punched their tickets to Group B last night, joining the Rapids and Real Espana of Honduras who were already qualified by virtue of winning their respective league championships.

Metapan and Santos both advanced on aggregate scoring in the home-and-home format, despite losing last night.

First up for the Rapids will be Metapan, who lost 3-1 last night to the Puerto Rico Islanders (highlights above), leaving the aggregate scoring at level pegging, 3-3. However, Metapan’s away goal proved to be the difference, earning them the tiebreaker and a trip to Commerce City on Aug. 17.

Santos scored early in their match against Olimpia last night (highlights above), but Olimpia responded with 2 goals to win the match. However, Santos entered with a 3-1 lead and advanced to Group B, 4-3 on aggregate.

The format of the tournament is as follows: Rapids will play each club twice, home and away, between Aug. 17 and Oct. 20. If they are among the top two in the group after those 6 matches are played, they’ll advance to the quarterfinals, which don’t resume until early March 2012.

The Rapids’ depth will likely be tested over the course of the next two months as they will be competing in the CCL while simultaneously playing their MLS schedule. They host Chivas USA at DSG Park on Aug. 20, and have 6 other games on the MLS schedule between now and the conclusion of the CCL group stage.